pneuma vs quiddity

pneuma

noun
  • The spirit or soul. 

  • One of three levels of a human being, the spirit, along with the body and soul. 

  • A neume. 

quiddity

noun
  • The essence or inherent nature of a person or thing. 

  • A trifle; a nicety or quibble. 

  • An eccentricity; an odd feature. 

How often have the words pneuma and quiddity occurred in a corpus of books? (source: Google Ngram Viewer )